you can have sex Ms. Mummymelza. However there may be spotting / discharge if the cervix gets irritated and which usually sends them.. ladies into panic mode.
Can I ask where you heard that rogerbond? My doc has never said anything along those lines in either of my pregnancies. The only time I've heard that is if its a high risk pregnancy.
Bes to avoid sex in the first and early part of the second trimester.
Ask your doc to make sure, but most people can. As long as there are no complications, you should be fine.